John schade



J. SCHADE.

LOCK.

Patented Oct. 23, 1894.

(No Model.)

WIZ'NESSES' Q9.. m

Nrrnn @STATES PATENT FFICE.

JOHN SCHADE, on BROOKLYN, NEW YORK.

LOCK.

SPECIFICATION forming part of Letters Patent No. 528,114, dated October23, 1894. Application filed March 31, 1894;I Serial No. 505,938. (Nomodel.)

the following to be a full, clear, and exact" description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings,

and to letters of reference marked thereon,'

which form a part of this specification.

Figure l ofthe drawings is a representation of a bottom plan of thelock. Fig. 2 is a perspective view of key cylinder with rotary diskremoved. Fig. 3 is a perspective view of plug and cam. Fig.4 isalongitudinal section through disk, key cylinder and plug. Fig. 5 is aperspective view of modified form of plug. Fig. 6 is a side elevation oflock with key inserted, and key cylinder partially in section." Fig. 7is an enlarged view of top portion of key cylinder.

This invention has relation to certain new and useful improvements inlocks, my object being to provide a simple ward lock, having no pins ortumblers of any kind, but which will present great difficulties in theway of being fraudulently opened in any manner except with a keyspecially provided therefor.

A further object of my invention is to greatly simplify the constructionof the lock, making it of few parts, and thereby greatly reducing thecost and labor of manufacture.

With these objects in view, the invention consists in the novelconstruction and combination of parts all as hereinafter described Vandpointed out in the appended claim.

Referring to the accompanying drawings illustrating the invention, theletter A designates the cap plate of the lock to which is rigidlyattached, or it may be integrally formed with, a key cylinder or barrelB. Seated in the outer end portion of said cylinder or barrel, upon aiiange or shoulder a thereof, is a rotary disk C, secured againstremovalby spinning over the end portion ofthe said cylinder or barrel, or byotherwise pro` viding the same with an obstruction by which the diskwhen seated cannot pass. Formed in the said disk is a key slot b whichis made irregular by central obstructions or projections c, giving thesaid slot an offset d at each end thereof, and a central-offset c. Theexact form of the slot and the location and form of theobstructions orprojections is not materially essential, the object being to so arrangethe slot that no implement or false key can be introduced therethroughexcept it be specially grooved to pass` the said obstructions. Belowsaid disk, thecylinder or barrel B is formed with an internal shoulderor throat dwhich is cut away vertically at two opposite points at d,forming slots or` passes for the key in alignment with the key slot inthe disk when the latter is turned into proper relation thereto.

D designates aplug which works loosely in the cylinder or barrel,andwhich is attached to the usualcarn E which operates the bolt or latch.This plug is formed with two opposite vertical, lateral grooves F whichrun in from the end of the plug, which is formed with an obstruction orsolid central portion between said grooves.

G designates the key, which at two Opposite points isformed withthelaterai notches g which receive the shoulder or throat d as the keyand disk are rotated, the broad faces of the key having longitudinalgrooves h to pass the central obstructions c ofthe key slot b. The innerend portion of the key is cut away to form the legs t' which embrace the`plug D and engage with the grooves F thereof,

the key` being stopped in its entrance at the proper point to bring thenotches g thereof Opposite the throat or shoulder d. It is obvious thatthe key can be inserted and withdrawn only when the disk is in positionto align its slot with the passes in the said throat or shoulder. Theplug D being loose in the barrel or cylinder is free to accommodateitself to the lock.

It will be observed that the peculiar feature of this lock which rendersit difficult to pick consists in the combination of the laterally orthroat obstructed barrel or cylinder, the centrally obstructed key slot,and the centrally obstructed plug D. The lateral obstruction of thebarrel or cylinder prevents the lock being opened by the introduction ofa piece of metal or false key at either end of the slot, since thethroat or shoulder pre- ICO vents it from rotating, even if successfullyengaged with one of the grooves in the plug. The central obstruction ofthe slot prevents the introduction of a false key sufficiently wide toengage with the grooves in the plug, while the central obstruction ofthe plug bars the engagement with the said grooves of a false keyinserted through the central portion 0f the key slot. It will thereforebe observed that in order to fraudulently open lthis lock ,it would benecessary to devise a false key of such irregular and peculiar form thatit could with difficulty be introduced through the limited opening ofthe key slot, and if so introduced would necessarily be of such slendercharacter that it would not possess sufficient strength to overcome thetension ofthe latch spring. The lock therefore, while much simpler,offers all the difficulties to fraudulent opening, if not more, than thepin and turn bler locks in common use.

In Fig. 5,Ihave shown a modified form of the plug D, wherein the centralmetal is removed or bored out between the two key slot-s. The operationand principle is howeverthe same, the central cavity forming anobstruction or a portion upon which a false key introduced through thecenter of the key slot of the disk can take no effective bearing.

The key slot is usually made as much wider than the key, as the lateraldepth of the key slots in the plug.

In order to provide changes in diderent locks so that each can be openedonly by its own special key, it is only necessary to vary the locationof the throat or shoulder' d, placing it at or cylinder,

different positions in the barrel and correspondingly locate the lateralnotches of the key, it beingobvious that a key will not work any lockexcept these two features correspond with each other. I may also varythe location of the obstructions in the key slots and the correspondingface grooves of the key.

I am well aware that a rotary key disk is common in various locks; alsothat it is not new to centrally obstruct a key slot in a stationary keydisk or escutcheon, but l am not aware that such features have everbefore been combined with a pinless cylinder having internal lateralobstructions, and a cam plug having a central portion against which akey can take no hold, whereby a lock is provided which is as difficultto pick, if not more so, as one having pins and tumblers, and which isvery much more simple in pointof construction, and cheaper tomanufacture.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

In a lock, the combination with a non rotary key cylinder or barrelhaving an internal throat or projection formed with opposite key passesor slots, a rotary disk seated in the outer portion of said cylinder orbarrel and having a centrally obstructed key slot, and a bolt actuatingplug having lateral grooves or key seats, and a central portion againstwhich a key can take no hold, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN SGI-IADE.

Witnesses:

PHILIP C. MASI, GEORGE H. PARMELEE.

